I bought this to fit a nitrogen tank I bought to fill the remote reservoirs on shock absorbers. Gauges and controls work great. I replaced the adjustable sensor with one with a lower capacity but higher resolution. This suits my needs better, but for the most part the original was fine. The nitrogen needed to fill the shock absorber is very cheap, costing less than $1. Stores charge around $20. Of course, if you need to do a shock once, it makes sense to use a ship. If you have multiple shocks, schedule regular maintenance to get everything you need to fill up. This is much more convenient and saves money in the long run.